Improvement in low-water indicators and alarms



A. HAUN. Low-Water Indicator and Alarm.

No.209;25.' Patented Oct. 22,1878.

UNITED STATES PATENT OFFIoE.

ALFBEIIHAUN, OF PIGKWIOK, PENNSYLVANIA.

IMPROVEMENT IN LOW-WATER INDICATORS AND ALARMS.

Specification forming part of Letters Patent No. 209,259, dated October22, 1878; application filed September 14, 1878.

To all whom "it may concern:

Be it known that I, ALFRED HAUN, of Pickwick, in the county of Clarionand State of Pennsylvania, have invented certain new and usefulImprovements in Low-Water Indicators and Alarms; and I do hereby declarethe following is a full, clear, and exact description anduse myinvention, I will proceed to descrribe the exact manner in which it iscarried on I In the drawing, A represents the expansiontube, having itslower end provided with an outer screw-thread, by which it is adapted tobe connected with the gage-cock B of a steamboiler, said gage-cockserving as a stay or support to the expansion-tube, and thus renderingit secure in case it is desired to remove the boiler. To the upper endof said tubeA is seczlund the customary alarm-valve and whis- Drepresents a laterally-projecting valvestem, provided in its outer endwith a slot, d, for receiving the lower end of the right-angled orbell-crank lever E. The upper end of said lever is pivoted or fulcrnmedat c to the upper end of the plate F, which projects a short distanceabove the valve-stem.

A vertical rod, G, is connected to the portion 6 of the lever E, saidrod Gr extending downward through the outer end of alaterally-projecting arm, H, adjustably secured to the pipe A.

The lower end of the rod G is provided with a screw=threadand screw-nut,h, by means of which the lever E and valve-stem can be adjusted so thatthe valve will blow off at any desired point.

The adjustable rod Gr,'being connected to the lever E, exerts no actionupon the valvestem consequently the parts of the apparatus are thusrelieved of the excessive strain which must necessarily result where thesaid rod is connected directly with the valve-stem. The valve is keptagainst the seat when the Water in the boiler is at the proper height bymeans of the usual coiled spring surrounding the valve-stem.

By having the lever-power or the lever fulcrumed above the valve-stemless expansiontube is required in obtaining the desired result, and bymeans of which the indicator is adapted to be applied to boilers on allkinds of portable as well as stationary engines.

I represents a tube connecting the dome J of a boiler to the whistle, bymeans of which steam is conveyed from said dome to the whistle. Lrepresents a plug securely screwed in the upper end of theexpansion-tube, for the purpose of preventing the water from the boilercoming in contact with the whistlevalve, thereby obviating the greatestobjections to low-water alarms that work by expansion, in which thewater from the boiler, comin g in contact with the whistle-valve, causesit to corrode and leak or stick, rendering the whistle invariable as analarm.

The operation of the indicator and alarm is essentially the same asother alarms of this class. The water in the boiler having sunk belowthe water-line in the boiler gives place to steam, the greater heat ofwhich expands the tube longitudinally, which opens the valve and allowsthe steam passing through the pipe or tube leading from the dome ofboiler to blow the whistle, and thus give the alarm.

I claim as my invention- 1. The combination, with the expansion-tube,provided with an alarm valve and whistle, of the laterally-projectingvalve-stem and rightangled or bell-crank lever E, pivoted or fulcrumedabove said valve-stem, substantially as and for the purpose herein shownand described.

2. The combination,with the expansion-tube, having an alarm valveandwhistle, of the valvestem 1), right-angled lever E, pivoted orfulcrumed above said valvestem, and adjustable rod G, substantially asand for the purpose herein shown and described.

3. The combination, with the expansion-tube, provided with the usualalarm valve and Whistle, of the plug L, secured in the upper end of saidexpansion-tube, substantially as and for the purpose specified.

4. In a low-water indicator and alarm, the combination of theexpansion-tube, having an alarm valve and whistle, and adapted to besecured to the gage-cock of a steam-boiler, and

the connecting pipe or tube I, leading from the steam-dome of a boilerto the Whistle, substantially as and for the purpose herein shown anddescribed.

ALFRED HAUN.

Witnesses J. H. MERRILL, J. F. DASHIELL.

